0.9.0

• Updated imgui to 1.88
• Used more forward declarations to improve compilation times
• Made required arguments in config structs explicit - disabled default construction on them
• Added OptionSlider
• Added InspectableImage
• Changed style customization interface to member variables
• Replaced ImTextureID with a wrapper Texture type
• Added ConsolePanel
• Replaced Labellable interface with member var of type Label
• Replaced event interfaces with member vars Event<...>
• Changed observable properties to actually use ObservableProperty<...> wrapper
• Replaced many strings with string_views